Move status and audit label constants to shared/constants/labels

STATUS_LABELS was defined in the server, AUDIT_LABELS and AUDIT_COLORS
in the client. Both layers now import from a single shared source.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/pages/TicketDetail.tsx

@@ -63,29 +63,7 @@ const SEVERITY_OPTIONS = [
   { value: 5, label: 'SEV 5 — Minimal' },
 ];
 
-const AUDIT_LABELS: Record<string, string> = {
-  CREATED: 'created this ticket',
-  STATUS_CHANGED: 'changed status',
-  ASSIGNEE_CHANGED: 'changed assignee',
-  SEVERITY_CHANGED: 'changed severity',
-  REROUTED: 'rerouted ticket',
-  TITLE_CHANGED: 'updated title',
-  OVERVIEW_CHANGED: 'updated overview',
-  COMMENT_ADDED: 'added a comment',
-  COMMENT_DELETED: 'deleted a comment',
-};
-
-const AUDIT_COLORS: Record<string, string> = {
-  CREATED: 'bg-green-500',
-  STATUS_CHANGED: 'bg-blue-500',
-  ASSIGNEE_CHANGED: 'bg-purple-500',
-  SEVERITY_CHANGED: 'bg-orange-500',
-  REROUTED: 'bg-cyan-500',
-  TITLE_CHANGED: 'bg-gray-500',
-  OVERVIEW_CHANGED: 'bg-gray-500',
-  COMMENT_ADDED: 'bg-gray-500',
-  COMMENT_DELETED: 'bg-red-500',
-};
+import { AUDIT_LABELS, AUDIT_COLORS } from '../../../shared/constants/labels';
 
 const COMMENT_ACTIONS = new Set(['COMMENT_ADDED', 'COMMENT_DELETED']);